Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 169, Issue -, Pages 404-410Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2018.05.023
Keywords
Microcapsule; Two-stage release; Size distribution; Polyurea; Lambda-cyhalothrin; Control efficacy
Funding
- National Key Research Development Program of China [2017YFD0200300]
- National Natural Science Foundation of China [31772203]
Ask authors/readers for more resources
In this work, a series of polyurea-based lambda-cyhalothrin-loaded microcapsules (MCs) with three different size distributions (average diameters of 1.35 mu m, MC-S; 5.13 mu m, MC-M; and 21.48 mu m, MC-L) were prepared and characterized. The results indicated that MCs with a smaller particle size distribution had a faster release rate and excellent initial efficacy against pests. MC-L had a remarkably slow incipient release rate, outstanding photostability and better later-stage efficacy than that of the other tested MCs. The results clarified that the diameter distribution of MCs is the key factor in determining the release property and bioactivity of the MC formulations. Subsequently, the binary mixture MC formulations of MC(+ M), MC(S + L) and MC(M + L) were obtained by mixing MC-S, MC-M or MC-L at 1:1 to establish a two-stage release system utilized for foliar application situations. Greenhouse and field experiments showed that MC(S + L) provided an optimal efficacy, and its effective duration was much longer than that of the emulsifiable concentrate (EC) group. Therefore, the release system established in this study was simple and workable for regulating the initial and long-term efficacy by adjusting the particle size distribution; in addition, this system has potential applications in other fields such as drug delivery devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available